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Old 10-13-2011, 11:14 AM   #1
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Default Formula to calculate belt length for custom gearing?

Is there a formula to calculate belt length for custom gearing? I am building a drift car to play with between off-road and on-road racing.
The car is an XRAY FK05 with 34/20 pulleys on the rear and a 180mm belt. I am going to 34/26 pulleys and would like to find a belt the correct size rather than making a tensioner, if possible. Thanks.
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Old 10-13-2011, 02:09 PM   #2
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Originally Posted by Yeti AS3 View Post
Is there a formula to calculate belt length for custom gearing? I am building a drift car to play with between off-road and on-road racing.
The car is an XRAY FK05 with 34/20 pulleys on the rear and a 180mm belt. I am going to 34/26 pulleys and would like to find a belt the correct size rather than making a tensioner, if possible. Thanks.
have a look at post 3, hope it helps
http://forums.radiocontrolzone.com/s...d.php?t=120475
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Old 10-13-2011, 02:11 PM   #3
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Is there a formula to calculate belt length for custom gearing? I am building a drift car to play with between off-road and on-road racing.
The car is an XRAY FK05 with 34/20 pulleys on the rear and a 180mm belt. I am going to 34/26 pulleys and would like to find a belt the correct size rather than making a tensioner, if possible. Thanks.
You need 3 more teeth on the belt. (26-20)/2=3 because the belt will be covering 3 more teeth on the pulley and have the same distance between centers. I forget how the belts are specified but that will make it 9mm longer around.
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Old 10-13-2011, 02:12 PM   #4
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The belts are 3mr pitch so for every tooth it's 3mm in length so 180 mm belt divide by 3 = 60 , so do the pulleys you want take a string and wrap it around , mark it then measure the total mm's then divide it by 3
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Old 10-13-2011, 06:02 PM   #5
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Perfect! Thanks a bunch!
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